Pile driver attachment for percussive tools



193,5 I w. A. SMITH; l,1R 1,986,296

PILE DRIVER ATTACHMENT FOR PEcs'sIv Toons V Filed Jan. s1, 1934 2 sheetsshee 2 WA Smil/z Jl.

. INVENTOR 'BYv y.i5-zitented- Jan. 1, 1935 Lassalley Pme DRIVER ATT-Aonivmn'r For:l

PERCUSSIVE Toons Virginia Application January 31, 1934,.Scrial Ko. '709,125

` s claims. (citi-76)' This invention relates to pile drivers and more particularly to a pile driving attachment for percussive tools of the hammer type.

An'o'bjec't 'off the present invention is to p'rovide 'a Vpile driving attachment as specified which is rugged in construction, durable and embodies adjustable plates or guides for guiding'a pile during the driving operation. j

. With these arid other objects in view as may appear from theaccompanying specification, the invention consists of various features of construction and combination of parts,' which will be first described in connection with the accom- "panying drawings, showing a pile driving atform embodying the invention, andthe features' tachment for percussiv tools of thenpreferred forming theinvention will be sp'eciiic'zally' point-I ed out in the claims.

In the drawings: Fig. 1 is a longitudinal section through the imp oved pile driving attachment showing it i app 'led to a fragment of .an approved type of percussive tool.

Fig. 2 is a side elevation of a fragment of the pile driving attachmentand taken on the line Fig, 3 is a longitudinal section through a modified form of the pile driving attachment.

- Fig. 4 is Aa section on the line 4 4 of Fig. 3.

Referring more particularly to the drawings, a percussive tool of any approved type embodying a cylinder 1 in which the piston 2 reciprocates, 'is shown in fragment in Fig. 1 of the drawings. 'The cylinder l vhas a front head 3 attached `thereto by means of bolts 4in the usual manner 'and a front head bushing 5 is provided which serves as a guide for the stem 6 of the anvil block or pile striking member 7.

The front head 3 has extensions 8 and 9 formed thereon which project outwardly from the front head .and are spaced one from the other to receive a pile indicated at (A) in dotv andl dashlines, and between.

In operation, the piston 2 is reeiprocated by r duid, under pressure in the usual manner of permissive tools and this hammer piston tool striking the anvil block or pile striking member '7 imparts blows to the pile (A) for driving it.

Piles of diiierent widths or thicknesses are frefluently driven, and to provide for the proper guiding and steadying of such piles during the driving operation, cheek plates 9a and 10 are Aprovided which slide in suitable guide recesses 11 formed in the extensions 8 and 9. The cheek plates 9a and 10 are adjusted to vary the distancebetween their facing sides, to accom? mjodate different widths or thicknesses of piles (A) by means of adjusting screws 12.v The advjusting screws 12 are threaded into the cheek plates 9a and 10 and are rotatably mounted in the extensions 8 and 9. Collars 13 are formed on the adjusting screws 12 and areengaged by clamping nuts 14 forpreve'nting longitudinal movement yof the" adjusting vscrews A12. The clamp nuts 14 are of suicient size to permit` the withdrawal of the adjusting screws 12 from fthe front head extensions 8 and 9.'

Stop shoulders 15T are formed on the inner sides oi theiront head extensions 8 and 9 and limit the forward or outward movement of anvil loloclg:v or pile strikingmeinber 7. '.-,A 'step' Iorfoot rest on which the operator may rest his' 'roet 41e is dtachabiy attached tc the stems formed thereon which engage in suitablev bores in the front head extensions.

Referring specifically to the modified form, the front head extensions 8 and 9 have stops 15 formed thereon which limit the movement of the anvil block 7' in the same manner in which the stops 15 limit the movement of the anvil'block '7. The extensions 8 and 9' are attached to the cylinder (not shown) in any suit- -able manner and they have laterally extending bores formed therein which receive the stems 21 of the adjustable cheek plates 22 and 23. The cheek plates 22 and 23 are adjusted to regulate the distance between their facing surfaces by means of adjusting screws 12' which thread into the adjistable cheek plates and rotate in the extensions 8' and 9. The adjusting screws 12' are held against longitudinal movement in the front head extensions 8 and 9 by anges or collars 13' and clamping nuts 14', while the adjustable cheek plates 22 and 23 are held against rotation relative to the front head extensions by means of any suitable type of keys 24 which engage in suitable keyways 25.

A step 16 is attached to the front head extension 8.

While in the drawings the adjustable cheek plates 9a. and 10 and 22 and 23 are shown as circular, it is to be understood that they may be any desired shape without departing from the if founsfaesirabis. i i

tools, a pile striking member, a front-head, ex-

tensions on said front hea-d for lguiding said` striking member, cheek plates carried at the inner' facing sides of said4 extensions, adjusting screws rotatably carried by said extensionsand adjustably connected to said cheek piates 'for adjusting'the relativepositions ofthe facing surfaces of the cheek plates, and means on said. extensions for limiting theoutward movement of said striking member. '4

2. -2in a pile driving attachment for -percussive tools, a pile striking member, a' 'front'heacL extensions on said front head, 'adjusting' screws carried by said extensions and held against all movement with respect to said extensions except rotary movement-and cheek plates connected tov 'said adjus'tir'ig screws for movement towards orfroml each. `other on rotary movement of. the screws. l

3v. In a piledriving attachment for percussive tools, a `pile striking member, a front head, extensions on said front head. adjusting screws carried lbysaid extensions and held against all movement with respect to said extensions except rotary movement, cheek plates connected to said adjusting screws for movement towards or from each other on rotary movement of the screws, and stops formed on said extensions for limiting the movement of said striking member, said stops serving as guides for said cheek plates.

'b attachment ifdrtper'oussive tools pilftriki member? aifront-'lhead extensions on said front head, adjusting screws @carried by said extensions and held against all `movexnentwith-,nsspect to said extensions except 1 v:mtas{gr-nativerderfit" cheek plates connected to said adjusting screws for movement towards or from eachother on retary==inovement of the screws, 1 means for preventing rotary movement of said 4(meek"'plet`es;" and 'means for preventing longitudinal movement' of said'adjusting screws.

l5. anniedrivingy attachment for percussive tools, a pile striking member, a front head, extensionson said front head, said extensions provided withrecessesin their facing sides, adjusting screws? carried "by said extensions and projecting "intos'ad recesses;v and cheekf. plates mounted onsaid adjusting screws for movement into, and outv o'f said recesses upon rotation `of the screws.

l6. Inv a pledriving attachment for percussive.

tools, a pile striking memben. a front head, extensions onsaid frontl head, said extensions providedwith recesses in their facing sides, adjusting screws carried by said extensions and projecting' .into saidrecesses, cheek plates mounted on said adjusting screws 'for movement into and out'of saidl recesses upon rotationfof the screws, means for preventing rotary movement of said cheek plates, and means for preventing longitudual movementC of said adjusting screws.

` WILLIAM A. SMITH, Je. 

